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TT: Tiefe Temperaturen
TT 25: Postersitzung III: Pinning und Vortexdynamik, Massive HTSL, Bandleiter, Transporteigenschaften in HTSL, SL dünner Filme, Elektronen und Phononen in HTSL, Tunneln, Borkarbide, Quantenphasen und Metall-Isolator-Überg
änge, Anwendungen, Sonstiges
TT 25.15: Poster
Thursday, March 29, 2001, 14:30–17:00, Rang S\ 3
Charge Imbalance Effects in Nonlocal Measurements on YBa2Cu3O7 Thin Films — •S. Manzoor1, F. Mrowka1, P. Esquinazi1, M. Lorenz1, and K. Zimmer2 — 1Abt. Supraleitung und Magnetismus, Institut für Experimentelle Physik II, Universität Leipzig, D-04103 Leipzig — 2Institut für Oberflächenmodifizierung, Permoserstr. 15, D-04303 Leipzig
We report on nonlocal measurements of in plane voltages on Y123 thin films in transverse applied magnetic fields up to 9 Tesla. We find anomalously large nonlocal voltages at T ≤ Tc. The nonlocal signal is found to decay on a length scale Xcnl much larger than that of the parasitic signal proportional to the local voltage Xcl. At T > Tc(H) Xcnl is approximately independent of field, while at lower temperatures it displays a significant field dependence, tending towards saturation at higher fields µ0 H > 2 T. We attribute our results to the existence of long lived quasiparticles at the nodes of d-wave superconductors and the resulting charge imbalance.